7978517689130 has 32 divisors (see below), whose sum is σ = 14550570619920. Its totient is φ = 3149491671040.

The previous prime is 7978517689049. The next prime is 7978517689147. The reversal of 7978517689130 is 319867158797.

It is a Cunningham number, because it is equal to 2824627²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1532042391049 + 6446475298081 = 1237757^2 + 2538991^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8139599 + ... + 9066978.

Almost surely, 2^{7978517689130} is an apocalyptic number.

7978517689130 is a deficient number, since it is larger than the sum of its proper divisors (6572052930790).

7978517689130 is a wasteful number, since it uses less digits than its factorization.

7978517689130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17207194.

The product of its (nonzero) digits is 160030080, while the sum is 71.

The spelling of 7978517689130 in words is "seven trillion, nine hundred seventy-eight billion, five hundred seventeen million, six hundred eighty-nine thousand, one hundred thirty".